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Reports <code>StringBuilder</code>, <code>StringBuffer</code> or <code>StringJoiner</code> objects whose contents are read but not written to,
or written to but not read.
<p>Such inconsistent reads and writes are pointless and probably indicate
  dead, incomplete, or erroneous code.</p>
<p><b>Example:</b></p>
<pre><code>
  public void m1() {
    StringBuilder sb = new StringBuilder();
    sb.append("a");
  }
</code></pre>
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